[v4,0/3] tracing/user_events: Fix incorrect return value for writes when events are disabled and add its tests

Message

sunliming June 26, 2023, 11:13 a.m. UTC

Now the writing operation return the count of writes regardless of whether
events are enabled or disabled. Fix this by just return -EBADF when events
are disabled.

v3 -> v4:
- Change the return value from zero to -EBADF

v2 -> v3:
- Change the return value from -ENOENT to zero

v1 -> v2:
- Change the return value from -EFAULT to -ENOENT

sunliming (3):
  tracing/user_events: Fix incorrect return value for writing operation
    when events are disabled
  selftests/user_events: Enable the event before write_fault test in
    ftrace self-test
  selftests/user_events: Add test cases when event is disabled

 kernel/trace/trace_events_user.c                  | 3 ++-
 tools/testing/selftests/user_events/ftrace_test.c | 8 ++++++++
 2 files changed, 10 insertions(+), 1 deletion(-)

Comments

Beau Belgrave June 26, 2023, 4:36 p.m. UTC | #1

On Mon, Jun 26, 2023 at 07:13:41PM +0800, sunliming wrote:
> Now the writing operation return the count of writes regardless of whether
> events are enabled or disabled. Fix this by just return -EBADF when events
> are disabled.
> 
> v3 -> v4:
> - Change the return value from zero to -EBADF
> 

Applied these locally, ran a few tests. This looks good to me.

Acked-by: Beau Belgrave <[e-mail]>

Thanks,
-Beau

> v2 -> v3:
> - Change the return value from -ENOENT to zero
> 
> v1 -> v2:
> - Change the return value from -EFAULT to -ENOENT
> 
> sunliming (3):
>   tracing/user_events: Fix incorrect return value for writing operation
>     when events are disabled
>   selftests/user_events: Enable the event before write_fault test in
>     ftrace self-test
>   selftests/user_events: Add test cases when event is disabled
> 
>  kernel/trace/trace_events_user.c                  | 3 ++-
>  tools/testing/selftests/user_events/ftrace_test.c | 8 ++++++++
>  2 files changed, 10 insertions(+), 1 deletion(-)
> 
> -- 
> 2.25.1